Chapter 13

Question 1

Which types of stairs are generally independent of the floor structure and will not fail if the floor collapses?

a. L-shaped
b. Straight Run
c. U-Return

Answer 1

C

Question 2

A wooden, stacked, straight run stairway will collapse in one section if the carriage beam supports at the top or bottom fastened to the floors double trimmer are weakened by fire.

a. Disagree
b. Agree

Answer 2

B

Question 3

Injuries at fires with steel framed U-Return stairs incorrect

a. Members should avoid stepping on an intermediate landing when possible
b. Intermediate landings supported by a steel pan often collapse
c. The most serious injuries occur when the intermediate stair landing collapses
d. Intermediate landings most often collapse under the weight of a descending member
e. The most frequent cause of collapse is the failure of a tread or step

Answer 3

B Intermediate landings supported by a steel pan do not collapse